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“Dual regulated power supply is needed in many digital and analog circuits.Operational Amplifier like UA741 needed dual regulated power supply to operate.In normal regulated power supply,only positive voltage is regulated this leads to ground loop coupling which produces noise when powering circuits like FM transmitters using IC555. That’s why FM transmitter circuits are always powered using battery to eliminate noise.In digital circuits dual regulated power supply is used for safer operation of Analog To Digital Conversion without any error.”

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